# RS Aggarwal Class-8 Perimeter & Area of Plane Figure ICSE Maths Goyal Brothers

RS Aggarwal Class-8 Perimeter & Area of Plane Figure ICSE Maths Goyal Brothers Prakashan Solutions Chapter-23. We provide step by step Solutions of Exercise / lesson-23 Perimeter & Area of Plane Figure for ICSE Class-8  RS  Aggarwal Mathematics.

Our Solutions contain all type Questions of Exe-23 (A),  Exe-23 (B),  Exe-23 (C),  Exe-23 (D), Exe-23 (E), Mental Maths with Notes to develop skill and confidence. Visit official Website CISCE for detail information about ICSE Board Class-8 Mathematics

## RS Aggarwal Class-8 Perimeter & Area of Plane Figure ICSE Maths Goyal Brothers Prakashan Solutions Chapter-23

–: Select Topics :–

Notes on Perimeter & Area of Plane Figure

Exe-23 (A),

Exe-23 (B),

Exe-23 (C),

Exe-23 (D),

MCQs, Exe-23 (E),

Mental Maths

### Notes on Perimeter & Area of Plane Figure

#### Area

The surface covered by the border line of the figure is the area of the plain shape.Area is the region bounded by the shape of an object. The space covered by the figure or any geometric shapes is the area of the shape. The area of all the shapes depends upon its dimensions and properties. Different shapes have different areas. The area of the square is different from the area of kite.

#### Perimeter

The perimeter is the length of the boundary of the plane shape.Perimeter of a shape is defined as the total distance around the shape. Basically, its the length of any shape if it is expanded in a linear form. The perimeter of different shapes can match in length with each other depending upon their dimensions

The unit of the perimeter is same as the length unit.

#### Area of Trapezium

A trapezium is a quadrilateral whose two sides are parallel. And if its non-parallel sides are equal then it is said to be an isosceles trapezium

##### . By Splitting the figure

One way to find the Area of trapezium is to divide it into two or three plane figures and then find the area.

##### 2. By using formula

Another way is to calculate the area by using formula.

Area of  trapezium = 1/2 (sum of parallel side) x height

In this also we can split the rhombus into two triangles and can find the area of rhombus easily.

#### Formula of Area of Rhombus

Area of Rhombus = 1/2 (d1 x d2 )

#### Area of Special Quadrilaterals (Rhombus)

A rhombus is a quadrilateral with all the sides are equal and parallel but not the right angle. Its two diagonals are the perpendicular bisector to each other

#### Perimeter  and Area of Triangle

The triangle has three sides. Therefore, the perimeter of any given triangle, whether it is scalene, isosceles or equilateral, will be equal to the sum of the length of all three sides.  And the area of any triangle is the space occupied by it in a plane

#### Formula’s on Perimeter  and Area

 Shape Area Perimeter Terms Circle A = π × r2 Circumference = 2πr r = radius of the circle Triangle A = ½ × b × h S = a+b+c b = base, h = height a,b and c are the sides of the triangle Square A = a2 P = 4a a = length of side Rectangle A = l × w P = 2(l + w) l = length ,w = width Parallelogram A = b × h P = 2(b + h) b=base, h=vertical height

### Mental Maths

–: End of RS Aggarwal Class-8 Perimeter & Area of Plane Figure Solutions :–

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